package main

import (
	"os"
	"fmt"
)

type Reader interface {
	Read(b []byte) (n int,err error)
}

type Writer interface {
	Write(b []byte)(n int,err error)
}

type ReadWriter interface {
	Reader
	Writer
}

func main() {
	var w Writer
	w=os.Stdout

	fmt.Fprint(w,"我是黄柳淞")
}

